[tor-bugs] #4741 [Pluggable transport]: obfsproxy: don't log transmissions of a closed connection

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#4741: obfsproxy: don't log transmissions of a closed connection
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 Reporter:  asn                  |          Owner:  asn
     Type:  defect               |         Status:  new
 Priority:  normal               |      Milestone:     
Component:  Pluggable transport  |        Version:     
 Keywords:                       |         Parent:     
   Points:                       |   Actualpoints:     
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 If `proto_send()` or `proto_recv()` fail in `upstream_read_cb()` and
 `upstream_read_cb()`, we free the connection and still log transmission
 information on debug verbosity.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4741>
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